They were descendants of Isildur through the kings of Arthedain[2] and Anárion through Fíriel;[3] as such they regarded themselves as the legitimate heirs to both Arnor and Gondor. The Chieftains continued to take the kingly prefix of ar(a)-, to signify their royal heritage and their right to rule Arnor. When the line of Anárion failed, the Chieftains considered themselves the heirs of Anárion through their ancestor Fíriel; none of the Chieftains ever forgot Arvedui's claim to the throne.[4]